N-(nonachlorobiphenyl)aminopropyl-n{40 -dimethylamine

ABSTRACT

Microbiocidal ammonia and amino substituted halogenated biphenyls, as well as the nitrogen derivatives thereof such as quaternary ammonium compounds, amine oxides, imidazolines, amides, enamines, ampholytes, and the like. The ammonia and amino halobiphenyls are prepared by reacting the ammonia or the amine and the halobiphenyl reactants in such a manner that the ratio of amine to halobiphenyl is preferably limited to between two and five mols of amine to each mol of halobiphenyl.

United States Patent [1 1 Merianos et al.

[451 Sept. 18,1973

N-(NONACHLOROBIPHENYL) AMINOPROPYL-N-DIMETHYLAMINE Inventors: John J. Merianos, Jersey City, N.J.; Edward Griffin Shay, Suffem, N.Y.; Phillip Adams, Murray Hill; Alfonso N. Petrocci, Glen Rock, both of NJ.

Assignee: Millmaster Onyx Corporation, New

York, NY.

Filed: Mar. 15, 1972 Appl. No.2 235,064

Related US. Application Data Division of Ser. No. 883,636, Dec. 9, 1969, Pat. No. 3,663,620.

31] Int. Cl. C07c 91/16 [58] Field of Search 260/570.5 P

[56] References Cited UNITED STATES PATENTS 3,663,620 5/1972 Merianos et al. 260/570.5

Primary Examine rRobert V. Hines -AttomeyArthu'r A. Jacobs 57 I ABSTRACT Microbiocidal ammonia and amino substituted halogenated biphenyls, as well as the nitrogen derivatives thereof such as quaternary ammonium compounds, amine oxides, imidazolines, amides, enamines, ampholytes, and the like.

The ammonia and amino halobiphenyls are prepared by reacting the ammonia or the amine and the halobiphenyl reactants in such a manner that the ratio of amine to halobiphenyl is preferably limited to between two and five mols of amine to each mol of halobiphenyl.

1 Claim, No Drawings 1 N-(NONACHLOROBIPHENYL)AMINOPROPYL-N'- DIMETHYLAMINE' This is a division of co-pending application Ser. No. 883,636, filed Dec. 9, 1969 and now U.S. Pat. No. 3,6- 63,620.

This invention relates to amino derivatives of halogenated biphenyls and mixtures thereof, which have marked antimicrobial efficacy, and to the use thereof for treating industrial water; for the preservation of metal-working fluids; for use in germicidal detergenttype surface-active agents, including both synthetic and natural detergents, but especially soaps; and for the preservation of cosmetics and the like.

The compounds employed in the invention comprise (a) the mono-aminosubstituted halogenated biphenyls having the general structure:

wherein m is an integer from to S, n is an integer from 0 to 4, X is a halogen, and there is at least one halogen atom, R and R' being either selected from the group consistingof hydrogen, alkyl, and hydroxyalkyl, or the residue of an amine or a polyamine, or are part of a cyclic amine structure; and wherein R and R may be either the same or different, and may be part of a polyamine; or (b) the bis-aminosubstituted halogenated biphenyls having the general structure:

in which m and n are integers from 0 to 4, X, R and R are the same as above and there is at least one halogen atom, either separately or admixed; and with or without a content of unreacted halobiphenyl. In every case, X may be fluorine, chlorine, bromine, or iodine.

In addition to their own inherent microbiocidal activity, these amino compounds can be used as intermediates for the preparation of a variety of other nitrogen compounds having antimicrobial powers. Among such are quaternary ammonium compounds, tertiary amine oxides, imidazolines, ampholytes, Schiffs' bases, amides, metal-amino coordination compounds, and, in general, antimicrobial derivatives of the amino group or groups to which the polyhalobiphenyl portion additionally contributes its own characteristics, such as, for example, a high degree of tire retardancy.

By limiting the ratio of the amine or ammonia relative to the polyhalobiphenyl, preferably to between about two and five mols of amine for each mol of polyhalobiphenyl, a predominant amount of the monoamino substituted compounds are obtained. Above five mols, increasing amounts of the biscompounds occur, and at ten mols or more the diamino compounds predominate. In the following examples so conducted essentially the monamino compounds were obtained.

Where the chlorinated compounds are disclosed in the examples, the fluorinated, brominated, or iodinated compounds may be substituted in each case for the chlorinated compounds to obtain generally the same desired results.

As a source of raw materials, the Aroclors" (polychlorinated polyphenyls Monsanto) provided a range (said to contain 60% of chlorine) and Aroclor 1268 (said to contain 68% of chlorine). Others with other chlorine content, especially Aroclors" 1232, I242, 1248, i254, and 1262, having chlorine. content of about the percent by weight represented by the last two digits in each case, were also reacted, but the reaction rates of the members containing lesser amounts of chlorine were lower. In the case of these members, the addition of catalytic amounts of cuprous chloride or ferric chloride accelerated the reaction.

The halobiphenylamino compounds of the invention may be employed either as the free amines or as their salts of inorganic or organic acids in order to improve their compatibility with aqueous, oily or solvent systems or to satisfy pH requirements. Such acids may include, for example, hydrochloric, sulfuric, phosphoric, acetic, lauric, oleic, gluconic, oxalic, tartaric, citric,

benzoic and substituted benzoic, paratoluene sulfonic,

sulfamic, and the like. I

The following examples are intended to be descriptive; but not to limit the invention except as claimed.

EXAMPLE I A one liter, three-necked round-bottomed flask, fltted withan agitator, a thermometer and a reflux condenser, was charged with 360 grams (or one mol) of Aroclor 1260, and 3 l0 grams (or three mols) of diethylene triamine. The mixture was stirred thoroughly for 8 to 10 hours at l50-l65C. at atmospheric pressure until a snatch sample, taken under active agitation and dissolved in mixed isopropanol and water, indicated, by argentometric titration, that the reaction was essentially complete. The amine hydrochloride formed in the course of the reaction tended to separate to the top.

The reaction mixture was cooled to about 50C. and it was then drowned in aqueous hydrochloric acid, the amount of the latter being adjusted to give a pH of about 5 to 6. A clear solution was obtained, with a concentration of 25% to 45% by weight at room temperature.

A representative sample of this solution was made alkaline to about pH 10 by the addition of caustic soda. A gummy mass separated, which liquified on heating to about 70C. or higher. This was washed several times with hot water, and then dried.

The yield was essentially the theoretical, and calculated as the monosubstituted product, by equivalent weight titration in non-aqueous medium with perchloric acid, as crude N-(pentachlorobiphenyU- diethylene triamine.

EXAMPLE 2 in the apparatus of Example 1, 500 grams (or one mol) of Aroclor 1268" (assaying 70% Cl) andt3l0 grams (or three mols) of diethylene triaminewere reacted in a similar manner by heating slowly to about C, then at l25-l30C. for about four hours until the reaction was complete, as indicated by argentometric titration. The same finishing procedure as in Example l was utilized to yield the theoretical amount of N- (nonachlorobiphenyl) diethylene triamine.

EXAMPLE 3 ln apparatus similar to that of Example 1, and in a similar manner, 146 grams (or 0.5 mol) of Aroclor 1248 and 256 grams (or 2.5 mol) of diethylene triamine were reacted by heating at l80-l90C. for 36 hours. After 15 hours, reaction was 50% complete and after 36 hours, it was 99% complete, as determined by argentometric titration. The excess amine was distilled off and 150 grams was recovered. The residue was treated with aqueous hydrochloric acid to yield a 30% active clear solution of amber color at pH 6.6.

The product so obtained was made alkaline with caustic soda, and the separated N-(trichlorobiphenyl)- diethylene triamine was washed and dried. lt calculated 95%, by perchloric acid titration in non-aqueous medium.

EXAMPLE 4 In the same way, instead of being reacted with diethylene triamine, the polychlorobiphenyls were reacted with aliphatic and alicyclic polyamines such as ethylene diamine; 1,3-diaminopropane, dimethylaminopropylamine, triethylene tetramine, tetraethylene pentamine, hexamethylene-diamine, isophorone-diamine, ethanolamine, diethanolamine, hydroxyethylethylene diamine, piperazine and aminoethyl piperazine, to yield the corresponding polychlorobiphenylamino derivatives, as the monosubstituted compounds. The reaction may also be carried out instead with primary or secondary alkylamines in similar fashion. Representative'of these alkylamines are hexyl, octyl, nonyl, undecyl, dodecyl, tetradecyl, hexadecyl, octadecyl and octadecenyl amines.

The above amino derivatives of polychlorobiphenyls were employed as intermediates for the synthesis of nitrogen-bearing derivatives exemplified by the following types:

EXAMPLE 5 The products of Examples l-4, such as do not already contain a tertiary amino group, were first alkylated on an amino nitrogen by methods well known to the art (for example, by reaction with formaldehyde and formic acid) to form tertiary amines; these were then quaternized, as in the present example; or converted to their tertiary amine oxides, as in the following Example 7.

The quaternizing agents included such compounds as the alkyl halides, the substituted or unsubstituted benzyl halides, and chloromethylnaphthalene, dimethyl sulfate, and the like.

For example, 55 grams (or 0.1 mol) of N- (nonchlorobi-phenyl) aminopropyl-N,N'- dimethylamine and 17 grams (or 0.1 mol) of nhexylbromide were dissolved in 100 grams of isopropanol. The mixture was heated under reflux at atmospheric pressure at 8595C. for from 12 to 24 hours until reaction was essentially complete. The clear red to brown solution contained 87% of the theoretical of N-(nonachlorobiphenyl) aminopropyl-N',N'-dimethyl- Nhexyl ammonium bromide.

Similarly, the n-octyl, n-decyl, n-undecyl, n-dodecyl, n-tetradecyl, n-hexadecyl and n-octadecyl bromides were reacted to form the corresponding quaternary ammonium bromides.

Other quaternary ammonium salts were prepared, employing respectively, benzyl, ethylbenzyl, dichlorobenzyl and trichlorobenzyl halides; trimethylbenzyl halide; Z-methyI-S-isopropyl benzyl halide; and chloromethylnaphthalene. In such instance, the halide may be chloride or bromide.

EXAMPLE 6 258 grams (or one mol) of Aroclor 1242 and 322 grams (or about 7.5 mols) of ethanol were charged into an autoclave. To this was added 85 grams (or five mols) of liquid ammonia, after which the autoclave was sealed and heated with agitation to about 275C. under autogenous pressure for about five hours. The autoclave was cooled and the excess ammonia was released into an absorber. The charge was drowned in dilute hydrochloric acid and the unreacted Aroclor" was separated. The filtrate was made alkaline with caustic soda and the crude product was separated and dried, as a brown solid, in 131 grams or 55% yield of dichlorobiphenylamine. The nitrogen content was 5.6% (theory 5.85%).

EXAMPLE 7 From the tertiary amines prepared as in Example 5, the corresponding tertiary amine oxides were prepared. For example, 55 grams (or 0.1 mol) of N- (nonachlorobiphenyl)-aminopropyl-N',N'- dimethylamine was dissolved in 100 grams of isopropanol and the solution was heated at 75C. at atmospheric pressure under reflux and agitation, while adding gradually 20 grams (or 0.12 mol) of 35% aqueous hydrogen peroxide. The heating was continued for about 3 to 4 hours until the reaction was essentially complete and most of the excess hydrogen peroxide had decomposed. The product, N- (nonachlorobiphenyl) aminopropyl N',N'-dimethylamine-N'-oxide so obtained exhibited antimicrobial activity.

Instead of hydrogen peroxide, organic peroxides or ozone may be used.

EXAMPLE 8 Into a one liter round-bottomed flask fitted with an agitator, a thermometer, and a Dean and Stark water collection apparatus, were charged 52.4 grams (or 0.1 mol) of N-(nonachlorobiphenyl) ehtylenediamine and 14 grams (or 0.1 mol) of p-hydroxy-benzoic acid,along with 500 ml. of dry toluene. The mixture was agitated and heated until the mixture refluxed freely, and about 1.7 ml. of water was collected, during about 3 e to 4 hours.

About 250 ml. of the toluenewas stripped off, and the residue was cooled in an ice bath. The precipitated product was filtered and dried. A Kjeldahl determination showed a nitrogen content of 4.13% (theoretical 4.36%).

This product, N-(nonachlorobiphenyl)-aminoethyl- N'-p-hydroxybenzamide proved effective at 0.1% in the preservation from microbial decomposition of a wheat gluten paste.

Similarly, salicyclic acid, 2,4,5-trichlorobenzoic acid, and nicotinic acid were reacted with N- (nonachlorobiphenyl) ethylene diamine and N- (pentachlorobiphenyl) diethylene triamine, to produce their corresponding amides.

EXAMPLE 9 5 Schiff's bases. These displayed moderate antimicrobial activity.

EXAMPLE l Metal-amino coordination products were prepared by methods exemplified by the following procedure, from the products of Examples 1-4: 13.6 grams (or 0.1 mol) of anhydrous zinc chloride and 300 ml. of dry toluene were charged into a round-bottomed flask fitted with an agitator, a thermometer, a reflux condenser and a dropping funnel. The mixture was heated at 40C. while gradually adding a mixture of 157 grams (or 0.3 mol) of N-(nonachlorobiphenyl) ethylenediamine and 600 ml. of toluene. When the addition was complete, the mixture was heated for about 2 hours at the reflux temperature at atmospheric pressure.

After cooling to room temperature, the suspension was filtered off, to yield tris-[N-(nonachlorobiphenyl) ehtylene diamine] ZnCl This product was particularly effective in the preservation of paint films against fungal attack.

EXAMPLE 11 The related compounds were prepared by substituting for zinc chloride other salts such as BCl CuCl AlCl MnCl MgCl CoCl and the like, the amount of each varying with the molecular weight.

Using essentially the same procedure as in Example 10, their corresponding metal-amino-products were made using the monoamino substituted polyhalobiphenyls synthesized as in Examples 1-4, the amount of each varying with its respective molecular weight.

EXAMPLE 12 The polybromobiphenyls may be prepared by brominating biphenyl in the presence of catalysts such as iodine, iron or aluminum, and along with agents such'as sulfuric acid or chlorine, by methods known to the art. Such are described, for example, in British Pat. No. 934,970, and German Pat. Nos. 1,136,683 and 1,161,547.

The bromobiphenyls react with the amines and with ammonia in the same way as the chlorobiphenyls.

EXAMPLE 13 The Aroclors" may be converted to fluorinated biphenyls, with or without one or more residue halogen atoms, by fluorination followed by dehydrohal- .ogenation, by which process fluorine addition products EXAMPLE 14 The polyiodinated biphenyls are also prepared by methods known to the art, for example, by reaction of Aroclors with Kl.

These, too, react with amino compounds to yield the corresponding iodobiphenyl derivatives.

EXAMPLE 15 I 10-20 mm. pressure; the cooled residue was drowned in water containing caustic soda. The product layer was separated, washed and dried by heating at l 20C. at lO-20 mm. pressure to a brown paste. Titration with acid indicated an equivalent weight of 126, the theoretical being 115.

EXAMPLE 16 ln a similar manner, the bis-aminosubstituted derivatives of diethylene triamine with Aroclors 1,242, 1,248, 1,260, 1,262, and 1,268 were prepared.

EXAMPLE 17 The bis-aminosubstituted derivatives of the above Aroclors were prepared with ammonia and the amines of Examples 1 to 4 and 6, employing the techniques described therein.

EXAMPLE 18 For antimicrobiocidal evaluation of certain of the above compounds, the Standard Broth Inhibition test method was employed. Aliquots of the test materials were added to appropriate broth culture media contained in test tubes so that various concentrations of the test material in culture media were obtained. The tubes so prepared were inoculated with either 24 hour broth cultures of the test bacteria, or 14 day aqueous spore suspensions of the test fungi, or 7 day broth cultures of the algae. The inoculated tubes were incubated as follows: bacteria for 72 hours at 37C.; fungi for 14 days at 28C.; algae for 7 days at 25C. Following the aforementioned incubation period, the tubes were examined for the presence or absence of macroscopic growth. The lowest concentration of test material in the broth which does not permit macroscopic growth is designated as the Minimum Inhibitory Level 1n the following tables, these abbreviations of the designations of the organisms are employed: 15.0. Escherichia coli; S.f. Streptococcus faecalis; Ps.a. Pseudomonas aeruginosa; An Aspergillus niger; P.e. Penicilium expansum; C.p. Chlorella pyrenoidosa.

Certain representative quaternary ammonium salts of Example 5 were tested for static level of inhibition. These were the N-(nonachlorobiphenyl) aminopropyl- N',N'-dimethy1-.N'-alkyl ammonium bromides. The values are in parts per million of the quaternary.

TABLE 1 Gram negative Gram positive Fungi, Algae, Alkyl E.c. Ps.a. SJ. Am. P.c. C.p.

EXAMPLE 19 Certain derivatives of tripentaand nona-chlorobiphenyl amino compounds of Examples 1-4, were treated bacteriologically for minimum inhibition levelsthylaminopropylamine is referred to as DMAPA; iso-,

phorone diamine is referred to as [.D.; and hexamethylene diamine is referred to as H.D.

TABLE 2 (ompouml Iaic. Rm. SJ. 11.11 I.e. 0.11.

(J5E.I) 10 250 10 10 50 1 ("laUMAlA... 50 I 50 500 1 (llglL'l... l 1 L000 1,000 l (ll l).'l,. 5 50 10 lrt'ljl 10 100 10 ("lrl.|) l,l)00 l,000 1,()00 l,000 1,000 750 ()l LlL. 1,000 1,000 1,000 l,000 1,000 750 CMJ)" 10 100 100 1,000 1,000 50 ClflE-I) 10 100 100 1,000 1,000 10 0131).1 1 5 5 10 10 1 C]5H.D 10 500 50 50 10 1O Cl H. D 50 1, 000 50 500 1, 000 50 EXAMPLE 20 N-(nonachlorobiphenyl)-aminopropyl-N',N'- dimethylamine was formulated as an 0.5% solution, by weight, in an acetone-aqueous soap solution. A stock soap solution was first prepared at 10% concentration; 10 parts of this, 63 parts of acetone, 27 parts of distilled water and 0.5 parts of the product were mixed.

An 0.5% solution of the product was similarly prepared, substituting distilled water for the 10 parts of aqueous soap solution.

The bacteriostatic levels were determined on the S- cap" and No Soap" solutions and are, given in the following Table 3, in terms of parts per million of the product, and of Growth/No Growth against Escherichia coli.

TABLE 3 N-(nonachlorobiphenyl) aminopropyl-N ',N -dimethylamine No Soap ISO/200 The effectiveness of the aminosubstituted halobiphenyls as soap bacteriostat is clearly shown above, and also in the following test. This is especially significant since it is notorious that most soap bacteriostats are not very active against gram negative bacteria.

EXAMPLE 2] Sterile soap solution was prepared at 2.5% soap solids; N-(nonachlorobiphenyl)-aminopropyl-N',N'- dimethylamine was added to aliquots of this solution at 0.1% by weight, or 1,000 parts per million in the solution, and at a soap to product ratio of 25:1. For purposes of comparison, Phisohex (a proprietary product of Winthrop Laboratories, Division of Sterling Drug, Inc.) containing surface-active agents and 3% of 2,2-methylene-bis(3,4,6 trichlorophenol) was diluted with distilled water, also at the 1,000 ppm. level of bacteriostatic agent.

100 ml. aliquots of the respective solutions were transferred to Erlenmeyer flasks maintained at 25C. and were inoculated with 1 ml. of an aqueous suspension of a 24 hour agar growth of Escherichia coli.

At intervals of three and five minutes after inoculation, aliquots of each of the solutions were plated into nutrient agar to determine the number of surviving bac teria. The number of survivors after five minutes was compared with the number initially present, from which figures the percent of organisms killed was computed. The following percentages are the average of replicate counts.

TABLE 4 Percent of Escherichia coli killed in 5 minutes Phisohcx" 94.332596 Cl, DMAPA 99.363l% The present compounds are equally effective in synthetic detergents such as the fatty alcohol sulfates, and ether sulfates, and the alkylaryl sulfonates. The Maprofix WA series and Mapro-fix TLS" series (Onyx Chemical Co.) are representative of the first; "Maprofix ES" of the ether sulfates; and Ultrawet L60" (ARCO Chem. Co.) is representative of the sulfonates. Both soaps and detergents are effective in proportions of between about 20/1 and 100/l of the soap or detergent to the amino-halobiphenyl compounds.

EXAMPLE 22 0.5% by weight of N-(nonachlorobiphenyl)- aminopropyl-N',N'-dimethylamine was added at levels of 1% and 0.5% by weight, respectively, to a triethanolamine salt of Antara LM 500" (a complex organic phosphate ester produced by General Aniline and Film Corp.) and to Mahogany Sulfonate" (a petroleum sulfonate produced by Humble Oil and Refining Co.), both being examples of metal-working fluids.

A series of 24 hour broth cultures of Escherichia coli, Pseudomonas aeruginosa, Bacillus species, Proteus species and Aerobacter aerogenes were pooled, diluted with sterile broth and inoculated into the 100 ml. samples to provide 1 to l0 X 10 bacteria cells per ml. of the samples.

At weekly intervals up to nine weeks, the samples were examined to determine the number of viable organisms present. At the five week point, each jar was reinoculated as before, and the testing continued. The counts are given in the following table in which the count is to be multiplied by 10.

TABLE 5 N-( nonachlorobiphenyl)-aminopropyl-N',N'- dimethylamine Fluid Agent Compn. ppm. 0 l 2 3 Phosphate 0 4,200 23,000 l8,300 14,200 Phosphate 200 4,200 600 520 480 Sulfonate 0 4,200 22,000 l6,500 12,900 Sulfonate 200 4,200 430 7,400 5,400

Weeks 4 5 7 9 Phosphate 0 12,600 1 1,800 10.000 6,300 Phosphate 200 5 I0 470 390 380 Sull'onate 0 1 13,100 12,800 13,400 9,600 Sulfonate 200 3 .800 2,900 3 ,2 l 0 3 The term metal-working fluids," as used herein, are

those discussed in Metalworking Lubricantslby E.L.-

H. Bastian (McGraw Hill Co., 1951, pp. -56). The

present compounds have biocidal utility when intermixed in biocidally effective amounts with the fluids disclosed in this publication.

EXAMPLE 23 The efficacy of mixtures of the monoaminosubstituted halobiphenyls of Examples 1 to 4 with the bis-amino-substituted halobiphenyls such as those of Examples -16 was compared by bacteriological assay. Among the combinations were the following monoand bisderivatives halobiphenyls of diethylene triamine, with and without the presence-of the Aroclor from which they were prepared, namely Aroclors 1242, 1248, 1254, 1260, and 1268.

In each case, the following mixtures were prepared:

Mono 80%, bis

Mono 20%, bis 80% Mono 60%, bis 20%, Aroclor" 20% Mono 20%, bis 60%, Aroclor 20% Aroclor 100% The mixtures in general showed effective antibacterial activity, while the Aroclor from which they were derived had negligible activity.

EXAMPLE 24 The N-pentachlorobiphenyl)-diethylenetriamine of Example 1 was reacted with a series of fatty acids to' form imidazolines.

As agitated, round-bottomed flask fitted with a ther-' mometer and a take-off condenser was charged with 215 grams (or 0.5 mol) of the amino compound, and 75 grams (or 0.5 mol) of caprylic acid. The mixture was heated for about 2 hours at 160C. at atmospheric pressure, during which time the greater part of one mol of water was distilled off. The heating was continued for another half hour while drawing a vacuum to about 25 mm. pressure. On cooling, the loss in weight was found to be about 17 grams, indicating the formation and removal of two mols of water per mol of fatty acid resulting from the amidification and the closing of the ring. After acetylating an aliquot of the product, titration with standard perchloric acid indicated essentially complete conversion to the imidazoline. The yield was essentially 100%, as l-(pentachlorobiphenylaminoethyl)-2-heptyl imidazoline in the form of a light-amber aste. p Instead of the amino compound of Example 1, the corresponding amino compounds derived from triethylene tetramine or tetraethylene pentamine may be employed to yield the corresponding imidazolines.

In the same manner, imidazolines were prepared, substituting for caprylic acid a corresponding molar amount respectively, of acetic, propionic, butyric, valeric, caproic, oenanthic, pelargonic, capric, undecylenic, lauric, myristic, palmitic, and stearic acids.

EXAMPLE 25 In the same manner as in Example 24, imidazolines were prepared with the fatty acids of that example, with the product of Example 2. For example, 512 grams of the N-(nonachlorobiphenyl) diethylene triamine (or 1 mol) was reacted with 172 grams (or 1 mol) of capric acid, to yield 1-(nonachlorobiphenylaminoethyl)-2- nonyl-imidazoline, as a very viscous amber oil.

' Instead of the diethylenetriamine derivatives of Example 2, the corresponding derivatives from triethylene tetramine or tetraethylene pentamine may be used, and the C to C acids may replace the capric acid, to yield the corresponding imidazolines.

The imidazolines may be converted into their salts by treatment with the appropriate acid; or they may be quaternized if desired by reaction with agents such as are listed in Example 6.

The above imidazolines exhibited distinct microbiocidal activity.

In general, unless otherwise specified, wherever parts or proportions have been used herein, it referes to parts by weight.

The compounds or mixtures thereof or their salts and other derivatives exemplified above may be applied to the treatment of industrial water, both for use in cooling towers, air-conditioners, humidifiers and dehumidifiers and the like, and for use in process water as for example in paper manufacture, to control the growth of microorganisms and to prevent slime formation.

The products of this invention are also effective preservatives against microbial growth and action in cosmetic preparations such as creams, lotions, shampoos, and the like, when present therein in a proportion of about 0.25% to 2% by weight of the composition, preferably about 0.5%, to prevent discoloration, putrefaction, phase separation, etc., and to prevent infection resulting from the use of such contaminated cosmetics.

They may also be introduced into metal-working fluids, to preserve them against microbial action which results in decomposition and putrefaction, or breaking of emulsions, or to prevent dermatitus resulting from contact with spoiled cutting and grinding oils and the like.

They may also be used in detergents, including bar soap, as, for example, for a germicidal soap.

They may also be applied to inanimate hard or soft surfaces, such as hospital walls, floors and the like and to textiles, rugs and the like, to render them bacteriostatic or bacteriocidal.

The invention claimed is:

l. N-(nonachlorobiphenyl) aminopropy1-N',N'- 

